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87 results for “blenny”
Data from: How populations differentiate despite gene flow: sexual and natural selection drive phenotypic divergence within a land fish, the Pacific leaping blenny
Background: Divergence between populations in reproductively important features is often vital for speciation. Many studies attempt to identify the cause of population differentiation in phenotype through the study of a specific selection pressure. Holistic studies that consider the interaction of several contrasting forms of selection are more rare. Most studies also fail to consider the history of connectivity among populations and the potential for genetic drift or gene flow to facilitate or limit phenotypic divergence. We examined the interacting effects of natural selection, sexual selection and the history of connectivity on phenotypic differentiation among five populations of the Pacific leaping blenny (Alticus arnoldorum), a land fish endemic to the island of Guam. Results: We found key differences among populations in two male ornaments—the size of a prominent head crest and conspicuousness of a coloured dorsal fin—that reflected a trade-off between the intensity of sexual selection (male biased sex ratios) and natural selection (exposure to predators). This differentiation in ornamentation has occurred despite evidence suggesting extensive gene flow among populations, which implies that the change in ornament expression has been recent (and potentially plastic). Conclusions: Our study provides an early snapshot of divergence in reproductively important features that, regardless of whether it reflects genetic or plastic changes in phenotype, could ultimately form a reproductive barrier among populations.
FIGURES 1–2. Prosorhynchoides thomasi n in Exploiting mimicry: Prosorhynchoides thomasi n. sp. (Digenea: Bucephalidae) from the fang blenny genus Plagiotremus (Bleeker) (Blenniidae) from off Lizard Island on the Great Barrier Reef, Australia
FIGURES 1–2. Prosorhynchoides thomasi n. sp. 1. Ventral view of holotype from Plagiotremus tapeinosoma. 2. Cirrus-sac, ventral view. Scale bars 1, 200µm; 2, 100µm.
FIGURE 5 in Malacoctenus brunoi sp. n. (Blennioidei: Labrisomidae), a new scaled-blenny from Trindade Island, off Brazil
FIGURE 5. Type locality of Malacoctenus brunoi sp. n., rocky shore at the Farilhões reefs, Trindade Island. Photo by J. L. Gasparini.
FIGURE 6 in Malacoctenus brunoi sp. n. (Blennioidei: Labrisomidae), a new scaled-blenny from Trindade Island, off Brazil
FIGURE 6. Western South Atlantic, with indication of the Trindade-Vitória sea-mount chain. Arrow indicates Trindade Island, a volcanic formation laying about 1160 Km off Brazil, type locality of Malacoctenus brunoi sp. n. Map drawn by M. S. de Medeiros.
FIGURE 3 in Malacoctenus brunoi sp. n. (Blennioidei: Labrisomidae), a new scaled-blenny from Trindade Island, off Brazil
FIGURE 3. Malacoctenus brunoi sp. n., paratype. Photographed in an aquarium immediately after collection. Photo by J. L. Gasparini.
FIGURE 4 in Malacoctenus brunoi sp. n. (Blennioidei: Labrisomidae), a new scaled-blenny from Trindade Island, off Brazil
FIGURE 4. Malacoctenus brunoi sp. n., in its natural habitat, the rocky reefs of Trindade Island. Photo by T. Simon.
FIGURE 2 in Malacoctenus brunoi sp. n. (Blennioidei: Labrisomidae), a new scaled-blenny from Trindade Island, off Brazil
FIGURE 2. Malacoctenus brunoi sp. n., paratype. Photographed in an aquarium immediately after collection. Photo by J. L. Gasparini.
FIGURE 7 in Adelotremus leptus, a new genus and species of sabertooth blenny from the Red Sea (Teleostei: Blenniidae: Nemophini)
FIGURE 7. Xiphasia setifer, adult with head protruding from polychaete tube near vicinity of type locality of Aldelotremus leptus. Photo by Jean Louise Rose.
FIGURE 3. Precaudal vertebrae 7–11 in Adelotremus leptus, a new genus and species of sabertooth blenny from the Red Sea (Teleostei: Blenniidae: Nemophini)
FIGURE 3. Precaudal vertebrae 7–11 (epineurals and pleural ribs not shown) and associated pterygiophores, traced from digital radiographs, in two nemophin species: (A) Adelotremus leptus, holotype and (B) Petroscirtes thepassi, USNM 205296, male, 51.3 mm SL.
FIGURE 2 in Adelotremus leptus, a new genus and species of sabertooth blenny from the Red Sea (Teleostei: Blenniidae: Nemophini)
FIGURE 2. Partial radiograph of Adelotremus leptus, holotype. Digital radiograph by Sandra J. Raredon.
FIGURE 1 in Adelotremus leptus, a new genus and species of sabertooth blenny from the Red Sea (Teleostei: Blenniidae: Nemophini)
FIGURE 1. Adelotremus leptus, holotype, USNM 402770, 35.4 mm SL, adult female, Red Sea, Egypt (Anal fin and most of dorsal fin tightly pressed against body.). Photo by Jean Louis Rose.
FIGURE 6 in Adelotremus leptus, a new genus and species of sabertooth blenny from the Red Sea (Teleostei: Blenniidae: Nemophini)
FIGURE 6. Adelotremus leptus, holotype, with head protruding from polychaete tube. Photo by Jean Louis Rose.
FIGURE 5 in Adelotremus leptus, a new genus and species of sabertooth blenny from the Red Sea (Teleostei: Blenniidae: Nemophini)
FIGURE 5. Cephalic sensory pores in Adelotremus leptus, holotype; some lateral temporal pores possibly not detected.
FIGURE 4 in Adelotremus leptus, a new genus and species of sabertooth blenny from the Red Sea (Teleostei: Blenniidae: Nemophini)
FIGURE 4. Infraorbital bones (not drawn to same scale) in two nemophin species: (A) Adelotremus leptus, holotype (reversed right infraorbital) and (B) Petroscirtes thepassi, USNM 205296, male, 46.6. mm SL.
FIGURE 3 in Alloblennius frondiculus, a new species of blenny from the Andaman Islands (Teleostei: Blenniidae: Salariini)
FIGURE 3. Alloblennius frondiculus, holotype, showing cephalic sensory pores (lateral line pores not shown).
FIGURE 1 in Alloblennius frondiculus, a new species of blenny from the Andaman Islands (Teleostei: Blenniidae: Salariini)
FIGURE 1. Alloblennius frondiculus, holotype (right side reversed) WAM P.33265-004, 23.8 mm SL, female, Andaman Islands; insert is slightly enlarged ventral view of head. Photographs by S. R. Raredon.
FIGURE 2 in Three new species of triplefin blennies of the genus Enneanectes (Teleostei, Tripterygiidae) from the tropical eastern Pacific with a key to Pacific species of Enneanectes
FIGURE 2. Color photographs of male (above) and female (below) of Enneanectes glendae sp. nov. (photographs by D.R. Robertson).
FIGURE 5 in A new species of scaly blenny of the genus Labrisomus (Actinopterygii: Labrisomidae) from the tropical West Atlantic
FIGURE 5. Type locality of Labrisomus conditus sp. n., rocky shore at the Praia do Boldró, Fernando de Noronha, Pernambuco, northeastern Brazil (Photograph by C. Sazima).
FIGURE 4 in A new species of scaly blenny of the genus Labrisomus (Actinopterygii: Labrisomidae) from the tropical West Atlantic
FIGURE 4. Labrisomus conditus sp. n., adult female in natural habitat, showing nasal, supra-orbital, and nuchal cirri, dark pattern, and a profusion of pale blue dots on head, especially on chin and throat; sand grains are adhered to dorsum and first dorsal spine (Photograph by I. Sazima).
FIGURE 2 in A new species of scaly blenny of the genus Labrisomus (Actinopterygii: Labrisomidae) from the tropical West Atlantic
FIGURE 2. Labrisomus conditus sp. n., adult male in natural habitat, showing red-brown head, darkened brownish body, dark opercular spot with diffuse and incomplete broad orange margin, and pale blue dots overall but more conspicuous on head (Photograph by I. Sazima).
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